Cylindrical mandrel



FIG. 1 is a perspective view of the cylindrical mandrel of the present invention;

FIG. 2 is a first end view of the cylindrical mandrel of the present invention;

FIG. 3 is a second end view of the cylindrical mandrel of the present invention;

FIG. 4 is a right side view of the cylindrical mandrel of the present invention; and

FIG. 5 is a left side view of the cylindrical mandrel of the present invention.

FIG. 6 is a top view of the cylindrical mandrel of the present invention.

FIG. 7 is a bottom view of the cylindrical mandrel of the present invention; and,

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a cylindrical mandrel, as shown and described. 